沙障对流动沙丘植被重建作用的研究

摘要

Through studying the role of sand barrier on the ecological restoration in moving dune on the aspects of surface hardness and change of plant diversity,the results show that at different plant coverage and different position of sand barrier,the surface hardness shows wave change and increases with the increase of plant coverage.The plant species increases gradually in different year of building sand barrier（from three to seven year）,which there are 2,5,4,5 and 5 kinds of plant species separately.The seed density in soil seed pool are 28 grains/m2,133 grains /m2,305 grains /m2,277 grains /m2 and 694 grains /m2 separately.The different types of laying sand barrier can influence the biological diversity index.But the sand barrier can play a positive role on the invasion and colonization of natural plant species.%从流动沙丘表面硬度、植物多样性变化等方面研究了沙障对流动沙丘生态修复作用的影响,结果表明：在沙障不同位置、不同植被盖度下,沙面硬度值变化呈现出波浪型变化趋势,并随着植被覆盖度的增加沙面硬度值也增大。不同沙障设置年限（3～7年）内植物种逐渐增加,分别为2、5、4、5、5种,土壤种子库种子密度分别为28粒/m2、133粒/m2、305粒/m2、277粒/m2和694粒/m2。沙障铺设方式或沙障类型（即高立式或矮立式）不同对生物多样性指数的影响不同,但沙障对天然植物种的入侵和定居起到了积极的作用。